coreui / coreui-pro / 30653190239

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fix(Chip,ChipSet,ChipInput): expose real roles for chip selection and announce add/remove (#658)

Closes the WCAG suite's recorded chip-family GAPs:

- A selectable chip set is a horizontal role=listbox (aria-multiselectable in
  multiple mode) and stamps role=option on its chips, so aria-selected and
  aria-disabled land on roles that allow them. A standalone selectable chip is
  a toggle button (role=button) reflecting its state via aria-pressed. A
  non-selectable set is a role=group, which also legitimizes the documented
  aria-label. Author-provided roles always win.
- aria-disabled is only stamped on chips that carry a role; on a role-less
  chip the attribute was invalid (axe aria-allowed-attr) and is now removed,
  as are stale aria-selected attributes.
- ChipSet renders a visually hidden role=status region NEXT TO the set (a
  status child inside a listbox would violate its required children) and
  announces added/removed chips; wording is configurable via
  ariaAddedAnnouncement/ariaRemovedAnnouncement. ChipInput inherits the
  announcements; its mixed container (label + input + chips) opts out of
  container roles.

The chip-set 4.1.2/1.3.1/4.1.3 and chip-input 4.1.3 criteria are promoted to
built-in and audited in CI — including scripted assertions that removing and
adding chips update the status region. Documented in the v6 guide.

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